*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
li{
    list-style: none;
}
a{
    text-align: none;
}


.zong{
    height: 400px;
    display: flex;
    position: relative;
}
.zuo{
    width: 400px;
    height: 400px;
    background-color: antiquewhite;
}
.zuo img{
    width: 400px;
    height: 400px;
}
.xiao{
    width: 70px;
    height: 400px;
    margin-left: 12px;
}

.xiao ul li {
    width: 68px;
    height: 68px;
    margin-top: 10px;

}
.xiao li img{
    width: 68px;
    height: 68px;
    border: 2px solid transparent;
}
.yuo{
    width: 400px;
    height: 400px;
    background-color: red;
    display: none;
    background-size: 800px 800px;
}
.mask{
    width: 200px;
    height: 200px;
    position: absolute;
    pointer-events: none;
    display: none;
    background-color: rgba(0,0,0,0.3);

}